import { optionalCopy } from "@/utils/tools";

const state = {
  visitedViews: [],
  cachedViews: []
};

const mutations = {
  ADD_VISITED_VIEW: (state, view) => {
    if (state.visitedViews.some(v => v.path === view.path)) return;
    state.visitedViews.push(
      Object.assign({}, view, {
        title: view.meta.title || ""
      })
    );
  },
  ADD_CACHED_VIEW: (state, view) => {
    if (state.cachedViews.includes(view.name)) return;
    if (!view.meta.noCache) {
      state.cachedViews.push(view.name);
    }
  },

  DEL_VISITED_VIEW: (state, view) => {
    for (const [i, v] of state.visitedViews.entries()) {
      if (v.path === view.path) {
        state.visitedViews.splice(i, 1);
        break;
      }
    }
  },
  DEL_CACHED_VIEW: (state, view) => {
    for (const i of state.cachedViews) {
      if (i === view.name) {
        const index = state.cachedViews.indexOf(i);
        state.cachedViews.splice(index, 1);
        break;
      }
    }
  },

  DEL_OTHERS_VISITED_VIEWS: (state, view) => {
    state.visitedViews = state.visitedViews.filter(v => {
      return v.meta.noClose || v.path === view.path;
    });
  },
  DEL_OTHERS_CACHED_VIEWS: (state, view) => {
    for (const i of state.cachedViews) {
      if (i === view.name) {
        const index = state.cachedViews.indexOf(i);
        state.cachedViews = state.cachedViews.slice(index, index + 1);
        break;
      }
    }
  },

  DEL_ALL_VISITED_VIEWS: state => {
    const noCloseTags = state.visitedViews.filter(tag => tag.meta.noClose);
    state.visitedViews = noCloseTags;
  },
  DEL_ALL_CACHED_VIEWS: state => {
    state.cachedViews = [];
  },

  UPDATE_VISITED_VIEW: (state, view) => {
    for (let v of state.visitedViews) {
      if (v.path === view.path) {
        v = Object.assign(v, view);
        break;
      }
    }
  }
};

const actions = {
  addView({ dispatch }, view) {
    const v = optionalCopy(view, "matched");
    dispatch("addVisitedView", v);
    dispatch("addCachedView", v);
  },
  addVisitedView({ commit }, view) {
    const v = optionalCopy(view, "matched");
    commit("ADD_VISITED_VIEW", v);
  },
  addCachedView({ commit }, view) {
    const v = optionalCopy(view, "matched");
    commit("ADD_CACHED_VIEW", v);
  },

  delView({ dispatch, state }, view) {
    const v = optionalCopy(view, "matched");
    return new Promise(resolve => {
      Promise.all([dispatch("delVisitedView", v), dispatch("delCachedView", v)]).then(() => {
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        });
      });
    });
  },
  delVisitedView({ commit, state }, view) {
    const v = optionalCopy(view, "matched");
    return new Promise(resolve => {
      commit("DEL_VISITED_VIEW", v);
      resolve([...state.visitedViews]);
    });
  },
  delCachedView({ commit, state }, view) {
    const v = optionalCopy(view, "matched");
    return new Promise(resolve => {
      commit("DEL_CACHED_VIEW", v);
      resolve([...state.cachedViews]);
    });
  },

  delOthersViews({ dispatch, state }, view) {
    const v = optionalCopy(view, "matched");
    return new Promise(resolve => {
      Promise.all([dispatch("delOthersVisitedViews", v), dispatch("delOthersCachedViews", v)]).then(() => {
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        });
      });
    });
  },
  delOthersVisitedViews({ commit, state }, view) {
    const v = optionalCopy(view, "matched");
    return new Promise(resolve => {
      commit("DEL_OTHERS_VISITED_VIEWS", v);
      resolve([...state.visitedViews]);
    });
  },
  delOthersCachedViews({ commit, state }, view) {
    const v = optionalCopy(view, "matched");
    return new Promise(resolve => {
      commit("DEL_OTHERS_CACHED_VIEWS", v);
      resolve([...state.cachedViews]);
    });
  },

  delAllViews({ dispatch, state }) {
    return new Promise(resolve => {
      Promise.all([dispatch("delAllVisitedViews"), dispatch("delAllCachedViews")]).then(() => {
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        });
      });
    });
  },
  delAllVisitedViews({ commit, state }) {
    return new Promise(resolve => {
      commit("DEL_ALL_VISITED_VIEWS");
      resolve([...state.visitedViews]);
    });
  },
  delAllCachedViews({ commit, state }) {
    return new Promise(resolve => {
      commit("DEL_ALL_CACHED_VIEWS");
      resolve([...state.cachedViews]);
    });
  },

  updateVisitedView({ commit }, view) {
    const v = optionalCopy(view, "matched");
    commit("UPDATE_VISITED_VIEW", v);
  }
};

export default {
  namespaced: true,
  state,
  mutations,
  actions
};
